2018年日本北海道胆振东部<i>M</i><sub>w</sub>6.6地震运动学震源模型

吴双兰; 李涵; 崔臻; 野津厚; 庄海洋; 赵凯; 陈国兴

doi:10.3799/dqkx.2025.171

Volume 51 Issue 1

Jan. 2026

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Article Navigation > Earth Science > 2026 > 51(1): 199-214

Wu Shuanglan, Li Han, Cui Zhen, Nozu Atsushi, Zhuang Haiyang, Zhao Kai, Chen Guoxing, 2026. Kinematic Source Model of 2018 Hokkaido Eastern Iburi Mw6.6 Japan Earthquake. Earth Science, 51(1): 199-214. doi: 10.3799/dqkx.2025.171

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Wu Shuanglan, Li Han, Cui Zhen, Nozu Atsushi, Zhuang Haiyang, Zhao Kai, Chen Guoxing, 2026. Kinematic Source Model of 2018 Hokkaido Eastern Iburi M_w6.6 Japan Earthquake. Earth Science, 51(1): 199-214. doi: 10.3799/dqkx.2025.171

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Kinematic Source Model of 2018 Hokkaido Eastern Iburi M_w6.6 Japan Earthquake

doi: 10.3799/dqkx.2025.171

Wu Shuanglan^{1, 2
,
,},
Li Han¹,
Cui Zhen³,
Nozu Atsushi⁴,
Zhuang Haiyang^{1, 5},
Zhao Kai¹,
Chen Guoxing^{1
,
,}

1.
Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 211816, China
2.
Advanced Ocean Institute of Southeast University Nantong, Nantong 226010, China
3.
Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
4.
Port and Airport Research Institute, Kanagawa 2390826, Japan
5.
School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China

Received Date: 2025-05-27
Publish Date: 2026-01-25

Abstract

Abstract

Conducting waveform inversions to estimate the rupture process of media to large size of earthquakes is one of the effective methods to better understand the characteristics of strong ground motions. To investigate the generation mechanism of strong ground motions, this study evaluates the rupture process of the 2018 Hokkaido, Japan, earthquake through waveform inversion based on the corrected empirical Green's functions. It is found that, large slip regions are concentrated along the shallow southwestern- to northeastern-section of the fault around 6.0 km in length and within 12.0 km from the hypocenter. Within this region, the maximum final slip approximates to 3.5 m; two peak slip velocity regions are identified, with the primary one located 6.0 km southwestern, and the secondary one located 4.0 km northeastern, and both within shallow areas 15.0 km from the hypocenter. The maximum peak slip velocity is about 2.0 m/s. A rupture velocity of 2.0 km/s is identified, and the inverted source model corresponds to a magnitude $ {M}_{W}7.0 $. Furthermore, another 3 waveform inversions using different combinations of empirical Green's functions and additional 7 different combinations of near-fault strong motion stations are operated to investigate the robustness and reliability of the source model. Based on the evaluated source model, additional strong motions at stations, which are not used in the waveform inversion, are synthesized and the synthesized and observed velocities could match well. Similarities of the final slip distribution among different source models also could be obtained. Results demonstrate that the major spatiotemporal characteristics of slip are robust and reliable, which could offer useful information for future strong motion simulation and analysis.
- 2018 Hokkaido Eastern Iburi Earthquake,
- kinematic source model,
- waveform inversion,
- empirical Green's function,
- strong-ground motion waveform,
- seismology

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References(47)

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